US20060050988A1 - Fluoroscopy image verification - Google Patents
Fluoroscopy image verification Download PDFInfo
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- US20060050988A1 US20060050988A1 US11/217,062 US21706205A US2006050988A1 US 20060050988 A1 US20060050988 A1 US 20060050988A1 US 21706205 A US21706205 A US 21706205A US 2006050988 A1 US2006050988 A1 US 2006050988A1
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- fluoroscopy
- recording
- navigation system
- landmark array
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/36—Image-producing devices or illumination devices not otherwise provided for
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00681—Aspects not otherwise provided for
- A61B2017/00725—Calibration or performance testing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
- A61B2034/2046—Tracking techniques
- A61B2034/2055—Optical tracking systems
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/36—Image-producing devices or illumination devices not otherwise provided for
- A61B2090/364—Correlation of different images or relation of image positions in respect to the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/36—Image-producing devices or illumination devices not otherwise provided for
- A61B90/37—Surgical systems with images on a monitor during operation
- A61B2090/376—Surgical systems with images on a monitor during operation using X-rays, e.g. fluoroscopy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/12—Devices for detecting or locating foreign bodies
Abstract
Description
- This application claims priority of U.S. Provisional Application No. 60/655,596 filed on Feb. 23, 2005, which is incorporated herein by reference in its entirety.
- The present invention relates generally to registration of a fluoroscopy image. More particularly, the invention relates to verification of the acquisition accuracy for a fluoroscopy image that is registered within fluoroscopy-based navigation software.
- Fluoroscopy images, for example, can be acquired with the aid of a C-arc fluoroscopy apparatus. The images then can be transferred to a navigation system, which uses the images as a basis for image-assisted or image-guided surgery. One pre-condition for accurate image-assisted or image-guided surgery is establishing a spatial correlation between a virtual representation of a patient or body data and an actual anatomy of the patient. This process is called registration. The present invention allows the accuracy of this registration process for fluoroscopy images to be verified.
- Verification is beneficial because errors, which are undesirable, can occur in the registration process. Verification detects these errors and, thus, provides an indication of being within a specified or desired tolerance. Registration is often achieved by mapping points or markings on the fluoroscopy images, said markings being arranged in a known position on an attachment of the C-arc radiation source. If, however, an insufficient number of markers are mapped, or the mapping is inaccurate, registration errors can result.
- U.S. Pat. No. 6,697,664, U.S. Pat. No. 6,675,040 and U.S. Pat. No. 6,662,036 include descriptions of the principle of fluoroscopic navigation. However, these references do not provide solutions for reducing or minimizing registration errors.
- The invention relates to a system and method for verifying the registration of a fluoroscopy image. In accordance with the invention, an image shadow of an artificial landmark on a fluoroscopy recording and a position of an actual landmark at the time the recording was produced are compared. If the comparison is within a desired range, the registration is deemed acceptable. Otherwise, a new fluoroscopic image is requested and the process can be repeated.
- In one embodiment, there is provided a method for verifying the registration of a fluoroscopy image. In accordance with the method, an artificial landmark array is introduced into a radiation path of a fluoroscopy apparatus, the landmark array being trackable by a computer assisted, medical navigation system. A fluoroscopy recording is produced with the aid of the fluoroscopy apparatus, and a spatial position of the artificial landmark array at the time the fluoroscopy recording is produced is detected and stored. The fluoroscopy recording is registered onto previously acquired body image data of the navigation system using marking points mapped on the fluoroscopy recording, wherein the marking points are maps of markings on the radiation source. A correspondence between an image shadow of the artificial landmark array on the fluoroscopy recording and a position of the landmark array at the time the recording was produced is checked and, if within a desired range or tolerance, the registration is deemed acceptable. The correspondence can be checked via an output unit of the navigation system.
- Checking the correspondence between the artificial landmark array image shadow and the position reproduced in the navigation system enables the registration accuracy to be verified, irrespective of the patient registration and tracking equipment used. As a result, it is not necessary, within the framework of the invention, for the position of the landmark array to remain fixed or constant. Accordingly, fixing the landmark array with the aid of complicated equipment (which may be an obstruction during an operation) can be avoided. Further, since the spatial position of the landmark array can be stored, the invention enables removal or displacement of the array once the image(s) have been produced. This makes it possible, for example, to simply place the artificial landmark array on the patient while the verification recording is produced. Displacement of the patient's skin or of the landmark array (e.g., the patient is covered resulting in the array being displaced) does not have a negative effect on verification. Accordingly, it is not necessary to fixedly arrange the landmark array on an exposed bone. Thus, the invention enables a minimally invasive or even non-invasive way of verifying the registration accuracy of a fluoroscopy image.
- An additional advantage is that using the artificial landmark array allows a fluoroscopy image to be verified, even when conventional verification or registration using natural landmarks is not possible or would only be possible if further invasive incisions were made. This applies, for example, to registration in soft tissue and on long bones in the intermediate area of the bone, where no useful natural landmarks can be acquired.
- If an insufficient correspondence is established, it is possible to request or prompt a new fluoroscopy recording to be produced. As noted above, it is advantageous within the framework of the invention if the artificial landmark array is introduced into the radiation path of the fluoroscopy apparatus such that it can be removed after imaging. Further navigation (image-assisted surgery) can be performed with the aid of a separately provided navigation reference (reference star).
- A system for verifying registration of a fluoroscopy image produced with the aid of a fluoroscopy apparatus includes a navigation system and markings on a radiation source of the fluoroscopy apparatus, wherein the markings are mapped on a fluoroscopy recording as marking point maps. The navigation system is configured to register the fluoroscopy recording onto previously acquired body image data. The system also includes an artificial landmark array that can be located and tracked by the navigation system and which can be introduced into a radiation path of the fluoroscopy apparatus at the time the fluoroscopy recording is produced, and a storage device detects and stores a spatial position of the landmark array at the time the fluoroscopy recording is produced by the navigation system. An output unit of the navigation system can be used for checking a correspondence between an image shadow of the artificial landmark array on the fluoroscopy recording and a position of said landmark array as reproduced in the navigation system.
- The storage device can be a part of a computer unit of the navigation system. This is useful, for example, because the navigation system itself will also locate and/or track the position of the landmark array with the aid of a tracking system. In this respect, it may be realized that in accordance with a preferred embodiment of the invention, the artificial landmark array can comprise reference markers that are arranged on a holding structure. The artificial landmark array can be positionally determined and tracked by the tracking and/or camera unit of the navigation system, wherein the landmark array can be pre-calibrated in the navigation system and/or known in terms of its geometry.
- The holding structure preferably includes material that can be mapped by x-ray radiation, in particular a material that is semi-permeable or impermeable to x-ray radiation. In a preferred embodiment, the holding structure can be formed in the shape of a cross, with reference markers on outer ends of the structure.
- In the following, the invention is explained in more detail on the basis of an exemplary embodiment. The invention can include any of the features described herein, individually or in any combination, and the single enclosed figure, to which reference is now made, schematically shows a system in accordance with the invention.
- The invention also relates to a program which, when running on a computer or is loaded onto a computer, causes the computer to perform a method as cited above, and to a computer program storage medium which comprises such a program.
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FIG. 1 is a schematic representation of a system for fluoroscopy image verification in accordance with the invention. -
FIG. 2 is a block diagram of a computer system that can be used to implement the method of the present invention. -
FIG. 1 schematically shows asurgical navigation system 10 that includes acomputer unit 14, cameras and/ortracking unit 15 and ascreen output 17. Thenavigation system 10 monitors a fluoroscopy device, of which only anattachment 13 is shown inFIG. 1 . Theattachment 13 is connected to a radiation source of the fluoroscopy apparatus (not shown). Theattachment 13 includesmarkings 16 which, at the time afluoroscopy recording 12 is produced, are mapped on afluoroscopy recording 12 asmarkings 16′. Thefluoroscopy recording 12 can be initially registered in thenavigation system 10, at least in principle, using an array ofdifferent markings 16, also on different planes, pre-calibrated and known in the navigation system, e.g., the image content of the fluoroscopy recording can be spatially correlated with data provided to thenavigation system 10. To this end, the spatial position of the fluoroscopy apparatus (not shown) is advantageously determined in the navigation system when the recording is triggered. -
FIG. 1 also shows anartificial landmark array 11, which lies in a radiation path between theattachment 13 and therecording 12. Thearray 11 includes a cruciform holding structure 19, and markers orreference markers 18 are attached to the structure 19. The markers orreference markers 18 can be positionally determined and tracked by thenavigation system 10, in particular by the cameras and/or trackingunit 15. - In
FIG. 1 , theartificial landmark array 11 is mapped as 11′ on thefluoroscopy recording 12. The arrangement ofreference markers 18 on thelandmark array 11 can be clearly recognized by the stereotactic surgical system ornavigation system 10. Thelandmark array 11 represents a clearly identifiably arrangement, the geometry of which can be stored in thenavigation system 10. - As indicated above, a spatial relationship between the
fluoroscopy recording 12 and the attachment 13 (and therefore the fluoroscopy apparatus) can be determined by themarkings 16. This spatial relationship can be used to virtually display theartificial landmark array 11 on thescreen output 17. - In order to then verify the accuracy of the spatial relationship between the
recording 12 and theattachment 13, thelandmark array 11 can be mapped on therecording 12 and a virtual representation of thelandmark array 11 can be superimposed onto the map of thearray 11 onrecording 12. The virtual representation of the landmark array can be superimposed by thenavigation system 10 and displayed via thescreen output 17. A comparison of the two representations allows the accuracy to be checked, e.g., if the map of thearray 11 corresponds to its virtual image from thenavigation system 10, then the recording is sufficiently accurate. If this is not the case, then the recording should be repeated. - In addition, a movement by the
landmark array 11 with respect to theattachment 13 after the image has been produced will not impair verification, since the spatial position of thelandmark array 11 at the time the image was produced is detected by the navigation system 10 (via thereference markers 18, which are tracked by the cameras and/or tracking unit 15) and stored. In this way, thelandmark array 11 does not necessarily need to be in the same position for image acquisition and image verification, but can be removed after verification. Further navigation (image-assisted surgery) can be performed with the aid of a separately provided navigation reference (reference star). - Moving to
FIG. 2 , acomputer unit 14 for executing a computer program in accordance with the present invention is illustrated. Thecomputer unit 14 can be communicatively coupled to thecameras 15 to receive positional data therefrom, and to display three-dimensional positional data. Thecomputer unit 14 includes acomputer 22 for processing data, and adisplay 17, such as a CRT, LCD, or the like, for viewing system information. Akeyboard 26 andpointing device 28 may be used for data entry, data display, screen navigation, etc. Thekeyboard 26 andpointing device 28 may be separate from thecomputer 22 or they may be integral to it. A computer mouse or other device that points to or otherwise identifies a location, action, etc., e.g., by a point and click method or some other method, are examples of a pointing device. Alternatively, a touch screen (not shown) may be used in place of thekeyboard 26 andpointing device 28. A touch screen is well known by those skilled in the art and will not be described in detail herein. Briefly, a touch screen implements a thin transparent membrane over the viewing area of thedisplay 17. Touching the viewing area sends a signal to thecomputer 22 indicative of the location touched on the screen. Thecomputer 22 may equate the signal in a manner equivalent to a pointing device and act accordingly. For example, an object on thedisplay 17 may be designated in software as having a particular function (e.g., view a different screen). Touching the object may have the same effect as directing thepointing device 28 over the object and selecting the object with the pointing device, e.g., by clicking a mouse. Touch screens may be beneficial when the available space for akeyboard 26 and/or apointing device 28 is limited. - Included in the
computer 22 is astorage medium 30 for storing information, such as application data, screen information, programs, etc. Thestorage medium 30 may be a hard drive, for example. Aprocessor 32, such as an AMD Athlon 64™ processor or an Intel Pentium IV® processor, combined with amemory 34 and thestorage medium 30 execute programs to perform various functions, such as data entry, numerical calculations, screen display, system setup, etc. A network interface card (NIC) 36 allows thecomputer 22 to communicate with devices external to thecomputer unit 14. - The actual code for performing the functions described herein can be easily programmed by a person having ordinary skill in the art of computer programming in any of a number of conventional programming languages based on the disclosure herein. Consequently, further detail as to the particular code itself has been omitted for sake of brevity.
- Although the invention has been shown and described with respect to a certain preferred embodiment or embodiments, it is obvious that equivalent alterations and modifications will occur to others skilled in the art upon the reading and understanding of this specification and the annexed drawings. In particular regard to the various functions performed by the above described elements (components, assemblies, devices, compositions, etc.), the terms (including a reference to a “means”) used to describe such elements are intended to correspond, unless otherwise indicated, to any element which performs the specified function of the described element (i.e., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary embodiment or embodiments of the invention. In addition, while a particular feature of the invention may have been described above with respect to only one or more of several illustrated embodiments, such feature may be combined with one or more other features of the other embodiments, as may be desired and advantageous for any given or particular application.
Claims (16)
Priority Applications (1)
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US11/217,062 US7587076B2 (en) | 2004-08-31 | 2005-08-31 | Fluoroscopy image verification |
Applications Claiming Priority (4)
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EP04020625.2 | 2004-08-31 | ||
EP04020625A EP1629789B1 (en) | 2004-08-31 | 2004-08-31 | Fluoroscopic image verification |
US65559605P | 2005-02-23 | 2005-02-23 | |
US11/217,062 US7587076B2 (en) | 2004-08-31 | 2005-08-31 | Fluoroscopy image verification |
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EP1942662A1 (en) * | 2007-01-04 | 2008-07-09 | BrainLAB AG | Automatic improvement of tracking data for intraoperative C-arm images in image guided surgery |
US20090281566A1 (en) * | 2003-08-11 | 2009-11-12 | Edwards Jerome R | Bodily sealants and methods and apparatus for image-guided delivery of same |
ITTV20100133A1 (en) * | 2010-10-08 | 2012-04-09 | Teleios Srl | APPARATUS AND METHOD FOR CARRYING OUT THE MAP OF A THREE-DIMENSIONAL SPACE IN MEDICAL APPLICATIONS FOR INTERVENTIONAL OR DIAGNOSTIC PURPOSE |
WO2013016286A2 (en) * | 2011-07-23 | 2013-01-31 | Broncus Medical Inc. | System and method for automatically determining calibration parameters of a fluoroscope |
US8696549B2 (en) | 2010-08-20 | 2014-04-15 | Veran Medical Technologies, Inc. | Apparatus and method for four dimensional soft tissue navigation in endoscopic applications |
US8781186B2 (en) | 2010-05-04 | 2014-07-15 | Pathfinder Therapeutics, Inc. | System and method for abdominal surface matching using pseudo-features |
US9138165B2 (en) | 2012-02-22 | 2015-09-22 | Veran Medical Technologies, Inc. | Systems, methods and devices for forming respiratory-gated point cloud for four dimensional soft tissue navigation |
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US11690527B2 (en) | 2010-08-20 | 2023-07-04 | Veran Medical Technologies, Inc. | Apparatus and method for four dimensional soft tissue navigation in endoscopic applications |
ITTV20100133A1 (en) * | 2010-10-08 | 2012-04-09 | Teleios Srl | APPARATUS AND METHOD FOR CARRYING OUT THE MAP OF A THREE-DIMENSIONAL SPACE IN MEDICAL APPLICATIONS FOR INTERVENTIONAL OR DIAGNOSTIC PURPOSE |
CN103220975A (en) * | 2010-10-08 | 2013-07-24 | 泰莱伊奥斯有限责任公司 | Apparatus and method for mapping a three-imensional space in medical applications for diagnostic, surgical or interventional medicine purposes |
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Also Published As
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EP1629789B1 (en) | 2007-05-16 |
EP1629789A1 (en) | 2006-03-01 |
DE502004003843D1 (en) | 2007-06-28 |
US7587076B2 (en) | 2009-09-08 |
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